Everest Forms <= 3.4.3 - Unauthenticated PHP Object Injection via Form Entry Metadata

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Summary

CVECVE-2026-3296
StatePUBLISHED
AssignerWordfence
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-08 02:16:04 UTC
Updated2026-04-08 21:26:35 UTC
DescriptionThe Everest Forms plugin for WordPress is vulnerable to PHP Object Injection in all versions up to, and including, 3.4.3 via deserialization of untrusted input from form entry metadata. This is due to the html-admin-page-entries-view.php file calling PHP's native unserialize() on stored entry meta values without passing the allowed_classes parameter. This makes it possible for unauthenticated attackers to inject a serialized PHP object payload through any public Everest Forms form field. The payload survives sanitize_text_field() sanitization (serialization control characters are not stripped) and is stored in the wp_evf_entrymeta database table. When an administrator views entries or views an individual entry, the unsafe unserialize() call processes the stored data without class restrictions.

Risk And Classification

Primary CVSS: v3.1 9.8 CRITICAL from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.000260000 probability, percentile 0.070710000 (date 2026-04-14)

Problem Types: CWE-502 | CWE-502 CWE-502 Deserialization of Untrusted Data

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Wpeverest Everest Forms Contact Form Payment Form Quiz Survey Custom Form Builder affected 3.4.3 semver Not specified

References

ReferenceSourceLinkTags
www.wordfence.com/threat-intel/vulnerabilities/id/2693ae37-790d-4b18-a9ec-054c8... [email protected] www.wordfence.com
plugins.trac.wordpress.org/changeset/3489938/everest-forms/tags/3.4.4/readme.txt [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/everest-forms/trunk/includes/admin/views/html-admin-p... [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/everest-forms/tags/3.4.3/includes/evf-core-functions.php [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/everest-forms/tags/3.4.3/includes/admin/views/html-ad... [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/changeset [email protected] plugins.trac.wordpress.org
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Karuppiah Sabari Kumar (en)

Additional Advisory Data

SourceTimeEvent
CNA2026-02-26T20:24:52.000ZVendor Notified
CNA2026-04-07T11:35:53.000ZDisclosed
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